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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15655) Optimizer: Allow config option to disable n-way JOIN merging
Date Wed, 25 Jan 2017 09:17:28 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837417#comment-15837417
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Lefty Leverenz commented on HIVE-15655:
---------------------------------------

Doc note:  This adds *hive.merge.nway.joins* to HiveConf.java, so it needs to be documented
in the wiki for release 2.2.0.

* [Configuration Properties -- Query and DDL Execution | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]

Gopal added a TODOC2.2 label.  (Thanks!)

> Optimizer: Allow config option to disable n-way JOIN merging 
> -------------------------------------------------------------
>
>                 Key: HIVE-15655
>                 URL: https://issues.apache.org/jira/browse/HIVE-15655
>             Project: Hive
>          Issue Type: Bug
>          Components: Physical Optimizer
>    Affects Versions: 2.2.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>              Labels: TODOC2.2
>         Attachments: HIVE-15655.1.patch, HIVE-15655.2.patch, HIVE-15655.2.patch, HIVE-15655.3.patch
>
>
> N-way Joins in Tez produce bad runtime plans whenever they are left-outer joins with
map-joins.
> This is something which should have a safety setting.



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